Excavating-bucket.



W. 0. MITCHELL.

EXGAVATING BUCKET.

APPLICATION IILED DEC. 21, 1908.

925,588., Patented June 22, 1909.

INVENTDR W G. M1 TOHELL WILLIAM CLARK MITCHELL, OF SYDNEY, NOVA SUOTIA, ("ANADA.

EXCAVATING-BUCIET.

Specification of Letters Patent.

Patented June 22, 1909.

7 Application filed December 21, 1908. Serial No. 468,684.

To all whom it may concern:

Be it known that LWILLIAM CLARK MITCH- ELL, of Sydney, in the Province of Nova Scotia, Canada, have invented certain new and useful Improvements in Excavating-Buckets, of which the following is a specification.

My invention relates to improvements in excavating buckets of the scoop grab type and the objects of m invention are to provide a simple and e ective form of bucket having an unusually wide opening together with a powerful opening and closing action.

Further objects are to reduce the height of the bucket as much as possible and to provide means for adjusting the scoops whereby greater efiiciency may be secured in operating in hard or soft material as well. as in coarse or fine.

In its construction the bucket is formed of two scoops of suitable character adapted to form a single receptacle or bucket when their front edges are brought into contact. These scoops are suspended from shafts by a combination of arms or links and the power for opening and closing the same is applied through a series of shafts and ropes, the arrangement being such that the scoops as well as oscillating about their common center in opening or closing will also oscillate about other "separate centers thereby increasing the power of the digging action.

The general arrangement of the parts is such as to secure a minimum height of structure when the bucket is open, thereby lowering the center of gravity and reducing the tendency of the bucket to overturn to a minimum.

All these and other features of the invention are described more fully in the following specifications and drawings.

In the drawings, Figure 1 is a side elevation of the bucket. Fig. 2 is a vertical section through the same. Fig. 3 is an under view.

In the drawings, like figures of reference indicate corresponding parts in each figure.

Referring to the drawings 1 and 2 represent the scoops or trays of any suitable or convenient design and which are supported from a transversely extending shaft 3 by means of connecting pairs of links 4 and 5 pivoted to the shaft and to the front upper edge of the scoops, the said links being hereinafter referred to as the front links.

The scoops illustrated are substantially in the shape of buckets, the front edges of which are adapted to meet and form substantially a closed receptacle as hereinafter explained, however, the mechanism may so be ad'usted that the bucket will be left partially open to operate as a scoop.

In order to give a compound movement to the scoops in opening and closing as herein after described, triangular links 7 and 8 are pivoted to the front links 4 and 5 as by means of shafts 9 and 10 res ectively which extend between the arms 0 the respective pairs of links 4 and 5. The free inner ends of these triangular links are connected by a transversely extending shaft 11 while their outer ends are pivotally connected by pairs of arms 12 and 13 to suitable projections 12 and 13 on the outer end of the scoops. Provision is made for adjusting the pivoting point of the link bars 12 and 13 by forming sets of apertures 7 and 8 in the triangular links 7 and 8, the said apertures being adapted to receive and journal the pivoting shafts 14 and 15. The scoop is actuated by suitable opening and closing ropes and to journal these swinging pulleys or guide shafts 16 and 17 are provided on the outer end of the shaft 3. Two opening ropes 21 are provided extending at opposite sides of the structure of the bucket, each of the ropes passing through a pulley 17 then around a sheave 18 and then up where the end is secured to the shaft 3. Two closing ropes are likewise provided each of which passes through a pulley 16 then around a sheave 19 secured to the link 4 then around a sheave 20 secured to the link 5 and then back to sheave 19 where it is secured.

The operation of the bucket is as follows: A pull on the closing ropes 22 will, of course, draw the lower ends of the arms 4 and 5 toward each other causing the front ends of the scoops to swing together. As the ends of the scoops approach each other the free ends of the triangular links 7 and 8 swing down, thereby lowering the rear ends of the scoops and bringing the same into proper position to easily pass throu h the material which is being excavated. hen it is desired to open the bucket the closing line is slacked and an upward pull on the opening rope causes the free ends of the triangular links 7 and 8 to swing up toward the upper ends of the pairs of arms 4 and 5, and at the same time the upper ends of said arms are drawn down toward said links so that a very powerful and quick movement is secured which will open the bucket against considerable resistance.

It will be observed that the compound motion imparted to the buckets by means of the triangular links 7 and 8 is very effective in producinga powerful digging openin and closing action enabling the bucket to ump with great rapidity and to be very effective in digging into the ground. Further than this, if it is desired to make the bucket more in the nature of a scoop the pivoting point of the triangular links 7 and 8 may be adjusted as hereinbefore explained and the bucket will be found'to give equal efficiency as a scoop grab when the pivoting oints are adjusted between the limits of haf and full opening.

scope thereof, it is intended that all matter I contained in these specifications and drawings shall be interpreted as illustrative and not in a limiting sense.

What I claim as my invention is:

1. An excavating bucket including a central shaft, a air of scoops, front links connecting the s afts to the inner edge of the scoops, triangular links pivoted to the front links having their free ends pivotally connected, the rear links connected to the corners of the triangular links and to the rear of the S000 s, and means for opening and closingthe uckets.

2. An excavating bucket including a cen tral shaft, a pair ofscoops, front links connecting the shafts to the inner edge of the scoops, triangular links pivoted to the front links having their free ends pivotally connected, the rear links connected to the corners of the triangular links and to the rear of the S000 s, and means for opening and closing the uckets, and means adjusting the pivkoting of the rear links and the triangular 3. An excavating bucket including a central shaft, a pair of scoops, front lin s connecting the shaft with the pair of scoops, triangular links pivoted to the front links, a shaft pivotally connecting the free ends of the trian ular links having sheaves thereon, rear links with the rear of the scoops, a plurality of sheaves on the main shaft, an opening rope connected to the main shaft and then extending around the sheave on the shaft which pivotally connects the tria ular linksand then extending upwardly, an a closing rope operatively connected to the bucket.

5. An excavating bucket includin a central shaft, a pair of scoops, 'front lin connecting the shaft with the pair of scoops, triangular links pivoted to the front. links, a shaft pivotally connecting the free ends of the triangular lin s having sheaves thereon, rear links connecting the corners of the triangular links with the rear of the scoops, a plurality of sheaves on the main shaft, an o ening rope connected to the main shaft and t en extending around the sheave on the shaft which ivotally connects the triangular links and t en extendin upwardly, pulleys on the frontlinks an a closin rope connected to the pulley of one front link then extending across over the pulley on the opposite front link, then back over the first mentioned pulley and upwardly over one of the pulleys and the main shaft.

In witness whereof I have hereunto set my hand in the resence of two witnesses.

WIL IAM CLARK MITCHELL. Witnesses:

W. Onown, HAROLD RoBsoN.

, lin s connecting the corners of the triangular 

